6728005 has 8 divisors (see below), whose sum is σ = 8548632. Its totient is φ = 5065728.

The previous prime is 6727993. The next prime is 6728009. The reversal of 6728005 is 5008276.

It can be written as a sum of positive squares in 4 ways, for example, as 2259009 + 4468996 = 1503^2 + 2114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6728005 - 2⁹ = 6727493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6728009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39492 + ... + 39661.

It is an arithmetic number, because the mean of its divisors is an integer number (1068579).

Almost surely, 2^6728005 is an apocalyptic number.

It is an amenable number.

6728005 is a deficient number, since it is larger than the sum of its proper divisors (1820627).

6728005 is a wasteful number, since it uses less digits than its factorization.

6728005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79175.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 6728005 is about 2593.8398177220. The cubic root of 6728005 is about 188.7826603132.

The spelling of 6728005 in words is "six million, seven hundred twenty-eight thousand, five".